Quarterly Data (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Jul. 31, 2016	May 01, 2016	Jan. 31, 2016	Nov. 01, 2015	Aug. 02, 2015	May 03, 2015	Feb. 01, 2015	Nov. 02, 2014	Jul. 31, 2016	Aug. 02, 2015	Aug. 03, 2014
Net sales	$ 1,687	$ 1,870	$ 2,201	$ 2,203	$ 1,693	$ 1,900	$ 2,234	$ 2,255	$ 7,961	$ 8,082	$ 8,268
Gross profit	546	660	819	755	562	682	743	795
Net earnings attributable to Campbell Soup Company	$ (81)	$ 185	$ 265	$ 194	$ 17	$ 179	$ 222	$ 248	$ 563	$ 666	$ 866
Earnings per share, basic	$ (0.26)	$ 0.60	$ 0.85	$ 0.63	$ 0.05	$ 0.58	$ 0.71	$ 0.79	$ 1.82	$ 2.13	$ 2.76
Common Stock, Dividends, Per Share, Declared	0.312	0.312	0.312	0.312	0.312	0.312	0.312	0.312	$ 1.248	$ 1.248	$ 1.248
Taxes on earnings									$ 286	$ 283	$ 374
Earnings Per Share, Diluted	$ (0.26)	$ 0.59	$ 0.85	$ 0.62	$ 0.05	$ 0.57	$ 0.71	$ 0.78	$ 1.81	$ 2.13	$ 2.74
Goodwill and Intangible Asset Impairment, net of tax	$ 127	$ 0	$ 0	$ 0
Restructuring charges, after tax	7	9	10	23	$ 67	$ 11	$ 0	$ 0
Pension and postretirement benefits mark to market adj, net of tax	90	34	(4)	80	$ 69	$ 16	$ 0	$ 2
Other Income claim settlement, net of tax	$ 0	$ (25)	$ 0	$ 0
Goodwill and Intangible Impairment, Per Diluted Share	$ 0.41	$ 0.00	$ 0.00	$ 0.00
Restructuring charges, Per Diluted Share	0.02	0.03	0.03	0.07	$ 0.21	$ 0.04	$ 0.00	$ 0.00
Pension and postretirement benefits mark to market adjustment, Per Diluted Share	0.29	0.11	(0.01)	0.26	0.22	0.05	(0.00)	0.01
Other Income claim settlement, Per Diluted Share	(0.00)	(0.08)	(0.00)	(0.00)
Maximum [Member]
Share Price	67.89	65.48	56.63	52.37	49.54	48.31	47.45	45.12	67.89	49.54
Minimum [Member]
Share Price	$ 59.51	$ 54.97	$ 47.77	$ 45.23	$ 44.92	$ 44.45	$ 42.70	$ 41.15	$ 59.51	$ 44.92
Restatement Adjustment [Member]
Taxes on earnings	$ 13
Earnings Per Share, Diluted	$ 0.04